| 摘要 |
PURPOSE:To form a loop only by normal nodes even if a node is at fault by providing a changeover switch which has input/output terminals as many as a center node and general nodes and operates under the switching control of the center node. CONSTITUTION:The center node CN and plural general nodes N1-Nn are connected through input/output lines la and lb to the changeover switch SW which has input/output terminal IU0-IUn and OUT0-OUTn as many as the nodes, and the closed loop of each node is formed by the internal wiring of the SW. For example, if trouble occurs to the node N2, the internal wiring of the SW is switched with a control signal from the center node CN through a control line W to disconnect the faulty node N2 and constitute a closed loop by other normal nodes CN. For the purpose, signals of respective input/output terminals of the SW are only monitored and fault detection is performed easily. |
